import axios from 'axios'
import { sys } from './sys'
import { sessionCache } from '@/hooks/cache'
import { transParams , blobValidate} from '@/utils/index'
import errorCode from './errorCode'
import { ElMessage, ElMessageBox, ElNotification , ElLoading} from 'element-plus'
import useUserStore from '@/store/modules/user'
import { saveAs } from 'file-saver'



let downloadLoadingInstance
// 是否显示重新登录
export let isRelogin = { show: false }

axios.defaults.headers['Content-Type'] = 'application/json;charset=utf-8'


// 创建axios实例
const request = axios.create({
    // axios中请求配置有baseURL选项，表示请求URL公共部分
    baseURL: import.meta.env.VITE_APP_BASE_API,
    // 超时
    timeout: 10000
})

// request拦截器
request.interceptors.request.use(config => {
    config.headers['X-Access-Token'] = sys.getAccessToken()
    const isRepeatSubmit = config.headers.repeatSubmit == false 
    // get请求映射params参数
    if (config.method === 'get' && config.params) {
        const params =  transParams(config.params) 
        let url = config.url + '?' +params 
        config.params = {}
        config.url = url
    }
    if (!isRepeatSubmit && (config.method === 'post' || config.method === 'put')) {
        const requestObj = {
            url: config.url,
            data: typeof config.data === 'object' ? JSON.stringify(config.data) : config.data,
            time: new Date().getTime()
        }
        const requestSize = Object.keys(JSON.stringify(requestObj)).length // 请求数据大小
        const limitSize = 5 * 1024 * 1024 // 限制存放数据5M
        if (requestSize >= limitSize) {
            console.warn(`[${config.url}]: ` + '请求数据大小超出允许的5M限制，无法进行防重复提交验证。')
            return config
        }
        const sessionObj = sessionCache.getJSON('sessionObj')
        if (sessionObj === undefined || sessionObj === null || sessionObj === '') {
            sessionCache.setJSON('sessionObj', requestObj)
        } else {
            const s_url = sessionObj.url                // 请求地址
            const s_data = sessionObj.data              // 请求数据
            const s_time = sessionObj.time              // 请求时间
            const interval = 1000                       // 间隔时间(ms)，小于此时间视为重复提交
            if (s_data === requestObj.data && requestObj.time - s_time < interval && s_url === requestObj.url) {
                const message = '数据正在处理，请勿重复提交'
                console.warn(`[${s_url}]: ` + message)
                return Promise.reject(new Error(message))
            } else {
                sessionCache.setJSON('sessionObj', requestObj)
            }
        }
    }
    return config
}, error => {
    console.log(error)
    Promise.reject(error)
})

// 响应拦截器
request.interceptors.response.use(res => {

    // 未设置状态码则默认成功状态
    const code = res.data.code || 200
    // 获取错误信息
    const msg = errorCode[code] || res.data.message || errorCode['default']
    // 二进制数据则直接返回
    if (res.request.responseType === 'blob' || res.request.responseType === 'arraybuffer') {
        return res.data
    }
    if (code == 401) {
        if (!isRelogin.show) {
            isRelogin.show = true
            ElMessageBox.confirm('登录状态已过期，您可以继续留在该页面，或者重新登录', '系统提示', { confirmButtonText: '重新登录', cancelButtonText: '取消', type: 'warning' }).then(() => {
                isRelogin.show = false
                useUserStore().logout().then(() => {
                    location.href = '/index'
                })
            }).catch(() => {
                isRelogin.show = false
            })
        }
        return Promise.reject('无效的会话，或者会话已过期，请重新登录。')
    } else if (code == 500) {
        ElMessage({ message: msg, type: 'error' })
        return Promise.reject(new Error(msg))
    } else if (code == 403) {
        ElMessage({ message: msg, type: 'warning' })
        return Promise.reject(new Error(msg))
    } else if (code !== 200) {
        ElNotification.error({ title: msg })
        return Promise.reject('error')
    } else {
        return Promise.resolve(res.data)
    }
}, error => {
    console.log('err' + error)
    let { message } = error
    if (message == "Network Error") {
        message = "后端接口连接异常"
    } else if (message.includes("timeout")) {
        message = "系统接口请求超时"
    } else if (message.includes("Request failed with status code")) {
        message = "系统接口" + message.substr(message.length - 3) + "异常"
    }
    ElMessage({ message: message, type: 'error', duration: 5 * 1000 })
    return Promise.reject(error)
})

// 通用下载方法
export function download(url, params, filename, config) {
  downloadLoadingInstance = ElLoading.service({ text: "正在下载数据，请稍候", background: "rgba(0, 0, 0, 0.7)", })
  return request.post(url, params, {
    transformRequest: [(params) => { return transParams(params) }],
    headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
    responseType: 'blob',
    ...config
  }).then(async (data: any) => {
    const isBlob = blobValidate(data)
    if (isBlob) {
      const blob = new Blob([data])
      saveAs(blob, filename)
    } else {
      const resText = await data.text()
      const rspObj = JSON.parse(resText)
      const errMsg = errorCode[rspObj.code] || rspObj.msg || errorCode['default']
      ElMessage.error(errMsg)
    }
    downloadLoadingInstance.close()
  }).catch((r) => {
    console.error(r)
    ElMessage.error('下载文件出现错误，请联系管理员！')
    downloadLoadingInstance.close()
  })
}

/** 上传文件 */
export function upload(url, file, config){
    const formData = new FormData()
    formData.append('file', file)
    config = Object.assign({
        headers:{
            "Content-Type": "multipart/form-data"
        }
    }, config)
    return request.post(url, formData, config)
}
export default request  